[lwip-devel] [patch #9427] Add gethostbyname hook

[Joel Cunningham]

URL:
  <http://savannah.nongnu.org/patch/?9427>

                 Summary: Add gethostbyname hook
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: jcunningham
            Submitted on: Fri 04 Aug 2017 08:45:19 PM UTC
                Category: sockets/netconn
                Priority: 5 - Normal
                  Status: None
                 Privacy: Public
             Assigned to: jcunningham
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None

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Details:

0001-Add-gethostbyname.patch: adds a new hook (LWIP_HOOK_GETHOSTBYNAME) which
allows an external DNS resolver to be hooked into's LwIP
gethostbyname/getaddrinfo implementation and DNS stack.  The hook can handle
some or all of the queries

One use case for this hook is to run mDNSResponder in the same system as LwIP
(mDNSResponder also uses LwIP's socekt APIs) and have it handle .local queries
while LwIP stack handles unicast DNS queries

This allows applications to use LwIP's gethostbyname/getaddrinfo for all types
of queries supported in the system and not have to worry about using a
different API for each DNS resolver that actually handles the query

0001-Add-DNS-SD-hook-for-LWIP_HOOK_GETHOSTBYNAME.patch: This adds an
implementation of LWIP_HOOK_GETHOSTBYNAME that uses the
DNS-SD API provided by mDNSResponder

I've been using these in my port, which uses mDNSResponder (ported to LwIP)
only for MDNS queries (unicast queries use LwIP). This provides a unified DNS
subsystem that applications can use via gethostbyname/getaddrinfo.  I know
others have mDNSResponder in a system with LwIP, so I'd like to share this
approach



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File Attachments:


-------------------------------------------------------
Date: Fri 04 Aug 2017 08:45:19 PM UTC  Name: 0001-Add-gethostbyname-hook.patch
 Size: 3KiB   By: jcunningham

<http://savannah.nongnu.org/patch/download.php?file_id=41416>
-------------------------------------------------------
Date: Fri 04 Aug 2017 08:45:19 PM UTC  Name:
0001-Add-DNS-SD-hook-for-LWIP_HOOK_GETHOSTBYNAME.patch  Size: 8KiB   By:
jcunningham

<http://savannah.nongnu.org/patch/download.php?file_id=41417>

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